Excitonic ferromagnetism in the hexaborides
M. E. Zhitomirsky, T. M. Rice, V. I. Anisimov
Abstract
A ferromagnet with a small spontaneous moment but with a high Curie temperature can be obtained by doping an excitonic insulator made from a spin triplet exciton condensate. Such a condensate can occur in a semimetal with a small overlap or a semiconductor with a small bandgap. We propose that it is responsible for the unexpected ferromagnetism in the doped hexaboride material Ca1-xLaxB6.
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